Answer:
76.5 cm²
Step-by-step explanation:
Given the triangles are similar , then
ratio of sides = a : b , so
ratio of areas = a² : b²
Here ratio of sides = 9 : 13.5 = 2 : 3
ratio of areas = 2² : 3² = 4 : 9
let x be the area of Δ DEF and using proportion
= 
( cross- multiply )
4x = 306 ( divide both sides by 4 )
x = 76.5
The area of Δ DEF = 76.5 cm²
Answer:
2nd choice down
$929.84
Step-by-step explanation:
3.19*36=114.85
114.84+815=929.84
Answer:
x = 8
General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
Equality Properties
<u>Geometry</u>
- All angles in a triangle add up to 180°
Step-by-step explanation:
<u>Step 1: Set up Equation</u>
(7x - 1) + 80 + (6x - 3) = 180
<u>Step 2: Solve for </u><em><u>x</u></em>
- Combine like terms: 13x + 76 = 180
- Isolate <em>x</em> term: 13x = 104
- Isolate <em>x</em>: x = 8
C. Zeros
This is because you plug 0 into X to get the Y answer which is your x-intercept
